Manufactured by one of the world leading Oxygen (O2) sensor manufacturers for original equipment use, this NTK oxygen sensor is direct hook-up. Using OEM style connectors. No splicing of you old connector, this is direct fit.

Four Wire 94-97 Main Oxygen sensor
Four Wire Front Oxygen Sensor for 99-05 Miatas with Federal emissions
Four Wire Downstream Oxygen Sensor for 1996-2000 Miatas with Federal emissions